Process of manufacturing hollow glass articles.



PATENTED OCT. 4, 1904.

' P. T.SIEVERT. PROCESS OF MANUFAGTURING HOLLOW GLASSARTIGLES.

APPLICATION FILED FEB. 25, 1903.

N0 MODEL.

1 1 r 1 1/ 1 1H /I/ I I I! z 1/ UNITED STATES Patented October 4, 1904.

PATENT OFFICE.

PROCESS OF MANUFACTURING HOLLOW GLASS ARTICLES.

SPECIFICATION forming part of Letters Patent No. 771,581, dated October4, 1904. Application filed February 25, 1903. Serial No. 144,977. (Nomodel.)

To all whom, it may concern:

Be it known that 1, PAUL THEODOR SIEVERT, a subject of the King ofSaxony, and a resident of Dresden, Kingdom of Saxony, German Empire,have invented new and useful Improvements in Processes of ManufacturingHollow Glass Articles, of which the following is a specification.

A known process of producing certain hollow glass articles consists infirst forming a smaller hollow glass body or open-mouthed blank in apress-mold and afterward expanding said body into its final shape byblowing in a second mold. This method, when compressed air is used forthe blowing and expanding operation, does not always work tosatisfaction, inasmuch as the compressed air, entering by jerks orstarts, is liable to cause a too sudden expansion of the hollow body orblank previously formed by the press process, and thereby to produce anirregular distribution of the mass of glass in the finished article.

The object of the present invention is to avoid such irregularities; andit consists in this, that instead of using compressed air for finallyexpanding or blowing the preliminarily-pressed hollow glass body orblank in the second or finishing mold I apply at the open mouth of saidbody or blank while it is in the latter mold a moist closure, themoisture in which is caused by the heat contained in the glass itself tobe converted into steam, which forms the pressure agent for expandingthe glass body into the final shape in the same manner as is set forthin the United States Patents Nos. 637 ,038 and 637,899 for blowing outor expanding a glass bulb or sack held by a frame.

This improved process will produce a gradual expansion or blowing outinstead of asudden expansion or blowing out of' thepreliminarily-pressed hollow glass body or blank into its final shape,because the moist closure, which may be of the form of a simple cover,may repeatedly be put on the upper rim of the final mold and blank for alonger or shorter period of time and may be put on more or less firmlyor tightly, while the. mass of glass by its own weight sinks down intothe final mold. As said closure may be easily worked or handled by theoperator, the latter may continuously observe or watch how far thehollow glass body is advanced in its formation within the final mold,and the operator may exert his influence upon this formation by more orless quickly applying the closure or by more or less firmly pressing iton the rims of the final mold and blank. By this method a much betterdistribution of the glass will be ob-' tained than by blowing out orexpanding by compressed air, which latter will enter the hollow glassbody by jerks or starts.

In order to explain more fully the abovespecified improved process formanufacturing hollow glass articles, Irefer to the annexed drawings, inwhich a method of working the improved process is illustrated by way ofexample.

Figure 1 is a transverse vertical section of the preliminary press-mold,the plunger employed therein, and the hollow glass blank formed thereinby the plunger; Fig. 2, a transverse vertical section of thefinishing-mold, having placed within it the hollow glass blank which hasbeen formed by the press-mold and plunger; Fig. 3, a similar section ofthe finishing-mold, having the moist closure applied an 1 havingrepresented within it the finished hollow article, a bottle.

a is the press-mold, b the plunger, and c the hollow glass blankproduced by said mold and plunger.

(Z is the finishing-mold, f the moist closure, and c the blown andfinished article in the mold (Z.

The moist closure f may be of any material capable of retaining moistureand of resisting the pressure of the steam generated by the heat of theglass in the mold. It is represented as of wood faced with asbestos.

What I claim as my invention is- The within-described process ofmanufacturing hollow glass articles which consists in first forming fromliquid glass a hollow openmouthed blank, next placing said blank in amold of the desired shape for the exterior of the finished article, andafterward applying I once of two Witnesses, this 10th day of Febto themouth of the blank in said mold, amoist ruary, 1903. closure from themoisture in which steam is generated by the heat of the blank forexpand- PAUL THEODOR SIEVERT' 5 ing the latter Within the mold.lVitnesses:

In testimony that I claim the foregoing as PAUL E. SOHILLING,

my invention 1 have signed my name, in pres- PAUL AREAS.

